The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 1983
Filed:
Aug. 02, 1982
Applicant:
Inventor:
Michael K Martin, Houston, TX (US);
Assignee:
Shell Oil Company, Houston, TX (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
525280 ; 252 50 ; 252 / ; 525294 ; 525338 ;
Abstract
Lubricating oil additives having both dispersant and viscosity index-improving properties are prepared by contacting a star-shaped polymer having a poly(polyalkenyl aromatic) nucleus, at least three conjugated diene homopolymer or copolymer arms linked to the nucleus, and at least one polymerized nitrogen containing polar compound arm linked to the nucleus, with a rectant selected from p-toluenesulfonylhydrazide and hydrazine under conditions wherein the reactants release H.sub.2 N.sub.2, which adds across the residual double bonds in the polymer therein hydrogenating the aliphatic unsaturation and releasing N.sub.2 gas.